80 lines
1.7 KiB
Rust
80 lines
1.7 KiB
Rust
use core::marker::PhantomData;
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct RW;
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct R;
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct W;
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mod sealed {
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use super::*;
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pub trait Access {}
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impl Access for R {}
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impl Access for W {}
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impl Access for RW {}
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}
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pub trait Access: sealed::Access + Copy {}
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impl Access for R {}
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impl Access for W {}
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impl Access for RW {}
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pub trait Read: Access {}
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impl Read for RW {}
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impl Read for R {}
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pub trait Write: Access {}
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impl Write for RW {}
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impl Write for W {}
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct Reg<T: Copy, A: Access> {
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ptr: *mut u8,
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phantom: PhantomData<*mut (T, A)>,
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}
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unsafe impl<T: Copy, A: Access> Send for Reg<T, A> {}
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unsafe impl<T: Copy, A: Access> Sync for Reg<T, A> {}
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impl<T: Copy, A: Access> Reg<T, A> {
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pub fn from_ptr(ptr: *mut u8) -> Self {
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Self {
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ptr,
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phantom: PhantomData,
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}
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}
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pub fn ptr(&self) -> *mut T {
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self.ptr as _
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}
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}
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impl<T: Copy, A: Read> Reg<T, A> {
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pub unsafe fn read(&self) -> T {
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(self.ptr as *mut T).read_volatile()
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}
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}
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impl<T: Copy, A: Write> Reg<T, A> {
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pub unsafe fn write_value(&self, val: T) {
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(self.ptr as *mut T).write_volatile(val)
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}
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}
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impl<T: Default + Copy, A: Write> Reg<T, A> {
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pub unsafe fn write<R>(&self, f: impl FnOnce(&mut T) -> R) -> R {
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let mut val = Default::default();
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let res = f(&mut val);
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self.write_value(val);
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res
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}
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}
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impl<T: Copy, A: Read + Write> Reg<T, A> {
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pub unsafe fn modify<R>(&self, f: impl FnOnce(&mut T) -> R) -> R {
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let mut val = self.read();
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let res = f(&mut val);
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self.write_value(val);
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res
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}
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}
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